Regensburg 2022 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 23: Perovskite and Photovoltaics 2 (joint session HL/CPP/KFM)

HL 23.11: Vortrag

Mittwoch, 7. September 2022, 18:00–18:15, H34

Dynamic nuclear spin polarization in lead halide perovskites — Natalia Kopteva¹, Dennis Kudlacik¹, Marek Karzel¹, Mladen Kotur¹, Dmitri Yakovlev¹, Oleh Hordiichuk², Olga Nazarenko², Dmitry Dirin², Maksym Kovalenko^2,3, Manfred Bayer¹, and •Erik Kirstein¹ — ¹Experimentelle Physik 2, TU Dortmund, 44221 Dortmund, Germany — ²Laboratory of Inorganic Chemistry Department of Chemistry and Applied Biosciences, ETH Zürich, CH-8093 Zürich, Switzerland — ³Laboratory for Thin Films and Photovoltaics Empa-Swiss Federal Laboratories for Materials Science and Technology, CH-8600 Dübendorf, Switzerland

Lead halide perovskites are promising for applications in spintronics due to the nanosecond coherence time of the resident carriers [1]. The primary source of losing spin coherence is the interaction with the fluctuating nuclear spin environment [2]. Optically oriented carrier spins polarize nuclei, which create an Overhauser field. Due to the different strengths of the hyperfine interaction with the nuclear spins, the electron and hole experience different magnitude and directions of the Overhauser field. To study the degree of nuclear spin polarization and fluctuation, we investigate the interaction of resident and optically created carrier spins with nuclei using the Hanle effect in the tilted magnetic field in bulk formamidinium caesium lead iodine bromide.

[1] V. V. Belykh et al., Nat. Commun. 10, 673 (2019)

[2] I. A. Merkulov et al., Phys. Rev. B 65, 205309 (2002)